Don't know if this feature is in GIMP yet or not.
But this logic/math was easily copied from the net for perfect mapping from square/rectangle (rectangle is scaled down to square) then mapped to the unit circle and scaled to fit square layer size.

Don't know if this feature is in GIMP yet or not.
But this logic/math was easily copied from the net for perfect mapping from square/rectangle (rectangle is scaled down to square) then mapped to the unit circle and scaled to fit square layer size.

There is the same in gmic_gimp_qt Deformations -> Square to Circle (and circle-to-square as a mode)

I thought why does your Circle Map plug-in have to be restricted to a circle? I have made a couple of slight alterations so that it maps a rectangular image to an ellipse. Absolutely of no use to anyone and even slower than your original!!!

Tin and David, don't apologize. This is how it should work. Working together, (even if you are not aware) is the way ideas evolve. Building, adding, altering, making it better or different. I love to see that in our forum!